[go: up one dir, main page]

US4446376A - Auxiliary power supply switching set - Google Patents

Auxiliary power supply switching set Download PDF

Info

Publication number
US4446376A
US4446376A US06/264,931 US26493181A US4446376A US 4446376 A US4446376 A US 4446376A US 26493181 A US26493181 A US 26493181A US 4446376 A US4446376 A US 4446376A
Authority
US
United States
Prior art keywords
power supply
battery
motor
generator
selectively
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/264,931
Inventor
Carl R. Baker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US06/264,931 priority Critical patent/US4446376A/en
Application granted granted Critical
Publication of US4446376A publication Critical patent/US4446376A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/028—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power
    • F03D7/0284—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power in relation to the state of the electric grid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/20—Wind motors characterised by the driven apparatus
    • F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
    • F03D9/255—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2220/00—Application
    • F05B2220/70—Application in combination with
    • F05B2220/706—Application in combination with an electrical generator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • Another object of the invention is to provide an improved control circuit.
  • Another object of the invention is to provide a control circuit that is efficient and economical.
  • FIG. 1 is a schematic circuit used.
  • auxiliary power supply and a main power supply A connected through lines 58, 59 and 60 and through the first switching means 15 to the load means or service panel 12 or to the auxiliary power supply made up of a motor M, generator G and windmill W, which are connected together by shaft 13.
  • DC motor M and AC generator are connected through lines 55, 56 and 57 through contacts 26, 27 and 28 on the second switching means 25 to the service panel 12.
  • a sensing unit 14 operates the normally closed contact 63, and normally open contacts 63A and 63B operate the second switching means contactor 25 when the voltage between lines 56 and 57 reach a predetermined value.
  • the sensing device 14 can obviously be made to operate at a predetermined frequency so that when the frequency of the voltage from generator 6 increases to and reaches a predetermined value, the sensing device will close contact 63A and 63B and open contact 63 thereby actuating the contactor 25 through its actuating coil 31 by way of its normally closed contact 30. This will close contact 29 and energize the actuating coil 16 on the switching means 15, thereby disconnecting the main power supply from the line and connecting the lines 55, 56 and 57 through contacts 26, 27 and 28 to the service panel 12.
  • the battery 69 is connected to rectifier 68 and off/on switch and fuse to the lines 56 and 57, and the batteries likewise connected through terminals L1 and L2 and lines 76 and 78 and through the double starter 62 to the motor M.
  • the double starter is a two-way switching starter having a first solenoid 80 and a second solenoid 81 and first contacts 82 and second contacts 83.
  • control 14 will be actuated through lines 66 and 67 closing contacts 82 and opening contacts 83. This will energize contactor 25 through contact 30, closing contacts 26, 27 and 28 and connecting lines 61, 62 and 63 to the windmill generator G. Contact 29 will energize solenoid 16 opening contacts 21, 22 and 23, thereby disconnecting the power lines 58, 59 and 60. Spring interlock 65 will insure through contact 21 that contacts 22, 23 and 24 are not closed when contacts 26, 27 and 28 are closed.
  • Contact 29 will lock contactor 25 closed, and it will stay closed until the voltage through contact 63B drops to a predetermined value.
  • control 14 when the wind velocity increases to a very high value, control 14 will open, returning the double starter 62 to its position shown in FIG. 2, reversing the current to motor M which will cause it to slow down.
  • Disk brake D will lock the windmill W when the circuit is not in use thereby protecting the system against high winds.
  • first switching means 15 is closed, as shown in normal position with the power lines 58, 59 and 60 connected to the service panel 12 through normally closed contacts 22, 23 and 24.
  • controller 14 will cause double starter 62 to close normally, open contact thereby reversing the current to motor M, thereby slowing it down to control voltage at lines 55, 56 and 57.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

A control circuit and auxiliary power supply and a switching means for connecting the load selectively to the auxiliary power supply and the main power supply.
The main power supply may be a public utility power line, and the auxiliary power supply is a windmill, a motor and generator all connected together on a common shaft. A control means senses the output voltage of the generator or output frequency and controls the switch to either connect the load to the power line or the auxiliary power supply.
A battery is supplied for storing excess windmill power and for driving the motor and generator during periods of low wind.

Description

STATEMENT OF INVENTION
The energy shortage that is extant in the world has brought attention to the need for an alternate source of energy. The energy available in the wind has long been recognized, but there is need for a practical way of utilizing the wind energy because of its intermittant nature. Applicant has invented a control circuit for utilizing the wind energy as an auxiliary power source when it is available and using the energy available from a public utility electrical line as a basic energy source.
REFERENCE TO PRIOR ART
Applicant knows of no prior art that anticipates the idea disclosed herein. U.S. Pat. Nos. 2,468,135 and 2,861,198 show the state of the art. The main purpose of U.S. Pat. No. 2,861,198 is to transfer power automatically. The prior art shows no sensing device for synchronizing the main power supply with the auxiliary power supply. When power is cut off the normal power supply, the auxiliary power supply cuts in. The circuit is not fused. The same is true of U.S. Pat. No. 2,468,135. Both patents, therefore, have many more mechanical parts than applicant's which applicant has eliminated yet retained their function. Applicant's invention therefore results in a simpler, more economical construction and is more efficient in operation.
OBJECTS OF THE INVENTION
It is an object of the invention to provide an improved control circuit for selectively connecting a main power supply and an alternate power supply to a load.
Another object of the invention is to provide an improved control circuit.
Another object of the invention is to provide a control circuit that is efficient and economical.
With the above and other objects in view, the present invention consists of the combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawing and more particularly pointed out in the appended claims, it being understood that changes may be made in the form, size, proportions and minor details of construction without departing from the spirit or sacrificing any of the advantages of the invention.
GENERAL DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic circuit used.
DETAILED DESCRIPTION OF THE DRAWINGS
Now, with more particular reference to the drawings, the auxiliary power supply and a main power supply A connected through lines 58, 59 and 60 and through the first switching means 15 to the load means or service panel 12 or to the auxiliary power supply made up of a motor M, generator G and windmill W, which are connected together by shaft 13. DC motor M and AC generator are connected through lines 55, 56 and 57 through contacts 26, 27 and 28 on the second switching means 25 to the service panel 12. A sensing unit 14 operates the normally closed contact 63, and normally open contacts 63A and 63B operate the second switching means contactor 25 when the voltage between lines 56 and 57 reach a predetermined value. The sensing device 14 can obviously be made to operate at a predetermined frequency so that when the frequency of the voltage from generator 6 increases to and reaches a predetermined value, the sensing device will close contact 63A and 63B and open contact 63 thereby actuating the contactor 25 through its actuating coil 31 by way of its normally closed contact 30. This will close contact 29 and energize the actuating coil 16 on the switching means 15, thereby disconnecting the main power supply from the line and connecting the lines 55, 56 and 57 through contacts 26, 27 and 28 to the service panel 12.
The battery 69 is connected to rectifier 68 and off/on switch and fuse to the lines 56 and 57, and the batteries likewise connected through terminals L1 and L2 and lines 76 and 78 and through the double starter 62 to the motor M. Thus, the motor M will be driven by the battery 69 when the voltage between lines 56 and 57 drops below a certain predetermined value. The double starter is a two-way switching starter having a first solenoid 80 and a second solenoid 81 and first contacts 82 and second contacts 83. When a wind rotates windmill W it rotates generator G and motor M. When this wind rotates generator G fast enough, battery 69 will receive a charging current through rectifier 68. As the windmill velocity increases voltage of lines 66 and 67, control 14 will be actuated through lines 66 and 67 closing contacts 82 and opening contacts 83. This will energize contactor 25 through contact 30, closing contacts 26, 27 and 28 and connecting lines 61, 62 and 63 to the windmill generator G. Contact 29 will energize solenoid 16 opening contacts 21, 22 and 23, thereby disconnecting the power lines 58, 59 and 60. Spring interlock 65 will insure through contact 21 that contacts 22, 23 and 24 are not closed when contacts 26, 27 and 28 are closed.
Contact 29 will lock contactor 25 closed, and it will stay closed until the voltage through contact 63B drops to a predetermined value.
Contact 21 will keep solenoid 16 energized until such voltage through contact 63B drops.
when the wind velocity increases to a very high value, control 14 will open, returning the double starter 62 to its position shown in FIG. 2, reversing the current to motor M which will cause it to slow down.
Disk brake D will lock the windmill W when the circuit is not in use thereby protecting the system against high winds.
Thus, in a no-wind condition first switching means 15 is closed, as shown in normal position with the power lines 58, 59 and 60 connected to the service panel 12 through normally closed contacts 22, 23 and 24.
When a stiff breeze blows, windmill W will rotate shaft 13 causing generator G to put out a voltage which will start a charging current to the battery via voltage regulator 69. When this voltage or frequency reaches a predetermined value, main controller 14 will be actuated closing contacts 63A and 63B and opening contact 63. The back EMF of motor M will oppose the flow of current from battery 67 through lines 73 and 74.
As the wind dies down, output voltage of the generator will drop below the battery voltage and the current will flow from battery 69 to motor M causing it to drive the motor and the windmill W, driving generator G until battery 69 is discharged, thereby continuing the operation or the auxiliary power supply for a maximum period of time. When the battery is discharged, the generator speed and consequently its voltage will drop, and both the motor and the windmill will stop.
Should the wind increase to a high value, controller 14 will cause double starter 62 to close normally, open contact thereby reversing the current to motor M, thereby slowing it down to control voltage at lines 55, 56 and 57.
The foregoing specification sets forth the invention in its preferred, practical forms but the structure shown is capable of modification within a range of equivalents without departing from the invention which is to be understood is broadly novel as is commensurate with the appended claims.

Claims (10)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. In combination, a main power supply,
an auxiliary supply,
a service panel,
and switching means for connecting the main power supply to the service panel and for selectively connecting the auxiliary power supply to the load when the voltage of the auxiliary power supply reaches a predetermined value,
said auxiliary power supply comprising a windmill,
a generator,
and a motor, all connected to a common shaft,
a battery,
means connecting the output of said generator to said battery,
a sensing means connected to the output of said battery and having means to selectively reverse connect said battery to the output of said motor depending on the voltage output of said generator thereby controlling the speed of said motor and said windmill.
2. The combination recited in claim 1 wherein said sensing means comprises a control member and,
a double starter having a first normally open contact and a second normally open contact and a normally closed contact,
a first switching means for connecting said main power supply to said first normally open contact being connected to actuating means on said second switching means,
said second normally open contact being connected to said battery and to said double starter,
said normally closed contact being connected to said double starter and to said battery for connecting said battery to said motor when the output of said generator drops below a predetermined value to drive said motor.
3. The combination recited in claim 2 wherein a rectifier is connected between the output of said generator and said battery,
whereby the output of said generator charges said battery when the output thereof exceeds a predetermined amount.
4. The combination of claim 1 wherein said voltage sensing device comprises a control means comprising,
a first normally open contact,
a second normally open contact,
and a normally closed contact,
said first normally open contact being connected to actuating means on said second switching means,
whereby said second switching means connects said auxiliary power supply to said service panel and disconnects said main power supply from said service panel when the voltage of said auxiliary power supply exceeds a certain value.
5. The combination of claim 1 wherein said means is provided to selectively connect said generator electrically to said motor and means for electrically connecting said generator to said battery, said switching means further provide a first contactor for connecting said main power supply to said service panel and a second contactor for selectively connecting said auxiliary power supply to said service panel, said sensing means being adapted to selectively activate said first contactor or said second contactor whereby said main power supply or said auxiliary power supply is selectively connected to said service panel and selectively connected to said battery to charge said battery or to connect said battery to said motor, whereby said motor is driven by said battery, and said motor drives said auxiliary generator for supplying power to said load.
6. The combination recited in claim 5 plus a voltage sensing control is connected to the output of said generator for operating said second contactor.
7. The combination recited in claim 6, wherein said control further comprises a two-way starter switch connecting said motor and said generator selectively to said battery to selectively drive said motor by power from said battery or to selectively drive said motor with power from said battery.
8. The combination recited in claim 7 wherein a disk brake is mounted on said windmill to lock said windmill when the wind driving said wind generator is low.
9. In combination a main power supply (A),
an auxiliary power supply, including a windmill, a motor, a battery, and a generator, W,M,G, (69),
a service panel (12), first power lines and second power lines, including load means (12) and sensing means (14),
first switching means (15) for electrically connecting said main power supply to said load means, and second switching means for connecting said auxiliary power supply W,M,G to said load means,
second switching means (25) for electrically connecting said auxiliary power supply (W,M,G, 69) to said load means,
control means for selectively actuating said first and second switching means selectively connecting said main power supply (11) or said auxiliary power supply W,M,G, (69) to said service panel,
said windmill (W) being mechanically connected to said motor and said generator for driving said motor and said generator,
said main power supply (A) comprising a power line (58), (59) and (60),
first electrical lines connecting said first switching means (15) to said power lines (58), (59) and (60),
said second electrical lines (55), (56) and (57) connecting said auxiliary power supply to said second switching means,
sensing means (14) having actuating means thereon connected to some of said second power lines (56) and (57),
said second power lines (55), (56) and (57) being connected to said battery,
said sensing means (14) having means thereon for actuating said first switching means (15) and
a third switching means (62) actuated by said sensing means for selectively connecting said battery to said motor to aid or to oppose the rotation of said motor and thereby control the speed of said windmill.
10. The combination recited in claim 9 wherein a disk brake is disposed on the output shaft of said windmill,
whereby said windmill may be selectively held against rotation.
US06/264,931 1981-05-18 1981-05-18 Auxiliary power supply switching set Expired - Fee Related US4446376A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US06/264,931 US4446376A (en) 1981-05-18 1981-05-18 Auxiliary power supply switching set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/264,931 US4446376A (en) 1981-05-18 1981-05-18 Auxiliary power supply switching set

Publications (1)

Publication Number Publication Date
US4446376A true US4446376A (en) 1984-05-01

Family

ID=23008247

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/264,931 Expired - Fee Related US4446376A (en) 1981-05-18 1981-05-18 Auxiliary power supply switching set

Country Status (1)

Country Link
US (1) US4446376A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4656413A (en) * 1986-06-19 1987-04-07 Bourbeau Frank J Stabilized control system and method for coupling an induction generator to AC power mains
US4721861A (en) * 1985-12-24 1988-01-26 Kabushiki Kaisha Toshiba Turbine helper drive apparatus
ES2119690A1 (en) * 1996-07-04 1998-10-01 Del Castillo Jose Luis Garcia Autonomous power regeneration system.
US5977656A (en) * 1998-07-01 1999-11-02 Lucent Technologies Inc. Switching network for circuit with multiple power sources
US6011327A (en) * 1997-12-19 2000-01-04 International Business Machines Corporation AC transfer switch
RU2148188C1 (en) * 1999-05-11 2000-04-27 Зорин Сергей Леонидович Mobile windmill electric generating plant
US20060055377A1 (en) * 2003-10-24 2006-03-16 Shinko Electric Co., Ltd. Power supply unit, generator, and wind turbine generator
US20060124641A1 (en) * 2004-11-09 2006-06-15 Karow Mark P Collapsible construction barrier
US20080084070A1 (en) * 2006-10-04 2008-04-10 General Electric Company Method, apparatus and computer program product for wind turbine start-up and operation without grid power
US20080129050A1 (en) * 2006-12-01 2008-06-05 Industrial Technology Research Institute Hybrid power-generating device
WO2009008863A1 (en) * 2007-07-12 2009-01-15 Mls Electrosystem Llc Method and apparatus for grid loss ride-through for wind turbine pitch control system
US20090189394A1 (en) * 2008-01-25 2009-07-30 Deangeles Steven J Momentum-conserving wind-driven electrical generator
WO2009138152A1 (en) * 2008-05-12 2009-11-19 Mario La Rosa Wind-powered generator system
US20100133829A1 (en) * 2007-04-02 2010-06-03 Quiet Revolution Limited Improvements in or relating to wind turbines
US20110018269A1 (en) * 2009-07-21 2011-01-27 George Moser Wind turbine
GB2472184A (en) * 2009-06-11 2011-02-02 Keith Platt Apparatus and method for supplying electricity to an electrical supply system.
GB2481033A (en) * 2010-06-09 2011-12-14 Robert John Lenney Wind turbine with battery-powered motor to assist the rotor in low wind conditions
US20130270826A1 (en) * 2012-04-16 2013-10-17 Envision Energy (Denmark) Aps Wind turbine with a primary and a secondary generator and method of operating such wind turbine

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1528045A (en) * 1921-01-08 1925-03-03 Westinghouse Electric & Mfg Co Automatic transfer switching system
US1756858A (en) * 1928-08-10 1930-04-29 Gen Electric Automatic switching system
US1785719A (en) * 1929-01-19 1930-12-16 Gen Electric Automatic control system
US1786310A (en) * 1929-01-29 1930-12-23 Gen Electric Control system
US1859069A (en) * 1929-07-19 1932-05-17 Gen Electric System of electric distribution
US2468135A (en) * 1945-04-03 1949-04-26 Westinghouse Electric Corp Transfer control system
US2861198A (en) * 1956-10-17 1958-11-18 Controllix Corp Transfer switch
US3808451A (en) * 1972-11-13 1974-04-30 Progressive Dynamics Ac power changeover
US3946242A (en) * 1975-03-03 1976-03-23 Wilkerson A W Geophysical energy source utilization circuit
US4180745A (en) * 1977-10-19 1979-12-25 Frank Bartlett Power regulating supply system for AC electrical loads

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1528045A (en) * 1921-01-08 1925-03-03 Westinghouse Electric & Mfg Co Automatic transfer switching system
US1756858A (en) * 1928-08-10 1930-04-29 Gen Electric Automatic switching system
US1785719A (en) * 1929-01-19 1930-12-16 Gen Electric Automatic control system
US1786310A (en) * 1929-01-29 1930-12-23 Gen Electric Control system
US1859069A (en) * 1929-07-19 1932-05-17 Gen Electric System of electric distribution
US2468135A (en) * 1945-04-03 1949-04-26 Westinghouse Electric Corp Transfer control system
US2861198A (en) * 1956-10-17 1958-11-18 Controllix Corp Transfer switch
US3808451A (en) * 1972-11-13 1974-04-30 Progressive Dynamics Ac power changeover
US3946242A (en) * 1975-03-03 1976-03-23 Wilkerson A W Geophysical energy source utilization circuit
US4180745A (en) * 1977-10-19 1979-12-25 Frank Bartlett Power regulating supply system for AC electrical loads

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4721861A (en) * 1985-12-24 1988-01-26 Kabushiki Kaisha Toshiba Turbine helper drive apparatus
US4656413A (en) * 1986-06-19 1987-04-07 Bourbeau Frank J Stabilized control system and method for coupling an induction generator to AC power mains
ES2119690A1 (en) * 1996-07-04 1998-10-01 Del Castillo Jose Luis Garcia Autonomous power regeneration system.
US6011327A (en) * 1997-12-19 2000-01-04 International Business Machines Corporation AC transfer switch
US5977656A (en) * 1998-07-01 1999-11-02 Lucent Technologies Inc. Switching network for circuit with multiple power sources
RU2148188C1 (en) * 1999-05-11 2000-04-27 Зорин Сергей Леонидович Mobile windmill electric generating plant
US7141887B2 (en) * 2003-10-24 2006-11-28 Shinko Electric Co., Ltd. Power supply unit, generator, and wind turbine generator
US20060055377A1 (en) * 2003-10-24 2006-03-16 Shinko Electric Co., Ltd. Power supply unit, generator, and wind turbine generator
US20060124641A1 (en) * 2004-11-09 2006-06-15 Karow Mark P Collapsible construction barrier
US20080084070A1 (en) * 2006-10-04 2008-04-10 General Electric Company Method, apparatus and computer program product for wind turbine start-up and operation without grid power
US7394166B2 (en) 2006-10-04 2008-07-01 General Electric Company Method, apparatus and computer program product for wind turbine start-up and operation without grid power
US20080129050A1 (en) * 2006-12-01 2008-06-05 Industrial Technology Research Institute Hybrid power-generating device
US7518257B2 (en) * 2006-12-01 2009-04-14 Industrial Techonology Research Institute Hybrid power-generating device
US20100133829A1 (en) * 2007-04-02 2010-06-03 Quiet Revolution Limited Improvements in or relating to wind turbines
WO2009008863A1 (en) * 2007-07-12 2009-01-15 Mls Electrosystem Llc Method and apparatus for grid loss ride-through for wind turbine pitch control system
US8432050B2 (en) 2007-07-12 2013-04-30 Windurance, LLC Method and apparatus for grid loss ride-through for wind turbine pitch control system
CN101796295B (en) * 2007-07-12 2012-11-28 Mls电子系统有限责任公司 Method and device for loss ride-through of wind turbine pitch angle control system
US20090189394A1 (en) * 2008-01-25 2009-07-30 Deangeles Steven J Momentum-conserving wind-driven electrical generator
US20100060003A1 (en) * 2008-01-25 2010-03-11 Deangeles Steven J Momentum-conserving wind-driven electrical generator
US7834473B2 (en) * 2008-01-25 2010-11-16 Deangeles Steven J Momentum-conserving wind-driven electrical generator
US20110031761A1 (en) * 2008-01-25 2011-02-10 Deangeles Steven J Momentum-Conserving Wind-Driven Electrical Generator
US7635923B2 (en) * 2008-01-25 2009-12-22 Deangeles Steven J Momentum-conserving wind-driven electrical generator
WO2009138152A1 (en) * 2008-05-12 2009-11-19 Mario La Rosa Wind-powered generator system
GB2472184A (en) * 2009-06-11 2011-02-02 Keith Platt Apparatus and method for supplying electricity to an electrical supply system.
GB2472184B (en) * 2009-06-11 2012-10-31 Keith Platt An electricity pylon including an apparatus and an associated method for supplying electricity to an electricity supply system
US20110018269A1 (en) * 2009-07-21 2011-01-27 George Moser Wind turbine
US8482147B2 (en) * 2009-07-21 2013-07-09 George Moser Wind turbine with powered synchronization system
GB2481033A (en) * 2010-06-09 2011-12-14 Robert John Lenney Wind turbine with battery-powered motor to assist the rotor in low wind conditions
US20130270826A1 (en) * 2012-04-16 2013-10-17 Envision Energy (Denmark) Aps Wind turbine with a primary and a secondary generator and method of operating such wind turbine
US8796873B2 (en) * 2012-04-16 2014-08-05 Envision Energy (Denmark) Aps Wind turbine with a primary and a secondary generator and method of operating such wind turbine

Similar Documents

Publication Publication Date Title
US4446376A (en) Auxiliary power supply switching set
CA1259655A (en) Interface control for storage battery based alternate energy system
JPS6123757B2 (en)
JPS58201544A (en) DC three-wire circuit device for vehicles with microcomputer
EP0424577A1 (en) Electric traction system
JPH03256591A (en) Power supply system for vacuum pump
US4451775A (en) Motor/generator starting circuit
US3940668A (en) Dual duty drive with induction motor
US5311108A (en) Control system for unidirectional motor having improved dynamic braking
CN212588287U (en) Motor remote control circuit
US4468606A (en) System for charging the battery and operating the electrical accessories of a sail-boat
SU1226598A1 (en) Method of braking induction motor
SU1275679A1 (en) Rectifier electric motor
JPH063338Y2 (en) Refrigerator controller
JPS588236B2 (en) Chiyokuryuu motor
SU1663735A1 (en) Multi-motor reversible drive
SU1432662A1 (en) Power supply arrangement with two d.c. voltage levels
CN2101971U (en) Electronic starter for refrigerator
JPH0884442A (en) Charger
SU1301734A1 (en) Arrangement for power supply of car
JPS6110454Y2 (en)
CN2202179Y (en) Automatic charging dc rolling machine
JP2504993Y2 (en) Regulator adjustment voltage switching device
JPH0587369A (en) Solar type ventilation system
US1422415A (en) Automatic electrical controlling device

Legal Events

Date Code Title Description
REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 19880501